#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>

int main()
{
	int a, b, c = 0;
	scanf("%d %d %d", &a, &b, &c);
	if (a + b > c && a + c > b && b + c > a)
	{
		if ((a == b && a != c) || (a == c && a != b) || (b == c && b != a))
			printf("Isosceles triangle!");
		else if (a == b && b == c)
			printf("Equilateral triangle!");
		else
			printf("Ordinary triangle!");
	}
	else
		printf("Not a triangle!");
	return 0;
}